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You are 100% correct but you should add a Latin name to complete your ID. It is this name that truly identifies your sighting and links it to others on iSpot.
Add a revised ID, enter Ruddy Darter and then press "get recommended" for the Latin name.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 54.7, -4.3
OS grid ref: NX518363